I am wondering if there is a way to connect the KW41Z with the K64F and use it as a thread border router. I know there is a way of doing it with CR20A.
You could load a host controlled device on the KW41Z, connect the boards through a serial interface (UART, I2C, SPI) and communicate the devices using THCI commands over FSCI. See Chapter 3. Host Software Overview in Kinetis FSCI Host Application Programming Interface.pdf.
As you already mentioned, you could use the K64F + MCR20A as a standalone border router, there is already demo project for that in the Connectivity Software package. In this approach, the Connectivity Framework and Stack is handled by the K64.
Thanks for the explanation it clears things up for me, I'll give it a try.
how could i get the connectivity software package with the demo project of K64F + MCR20A as border router that you have mentioned?
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